[LLVM-C] Deprecate the LLVMValueRef-returning metadata creation functions

[LLVM-C] Deprecate the LLVMValueRef-returning metadata creation functions

Summary: There is still some value in using these functions while the remaining LLVMValueRef-based accessors are still around, but LLVMMDNodeInContext in particular has some wonky semantics that make it worth replacing outright.

Reviewers: whitequark, deadalnix

Reviewed By: whitequark

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60524

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@359114 91177308-0d34-0410-b5e6-96231b3b80d8